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Long-term results following surgical operation of tetralogy of Fallot
Insights
Sudden cardiac death risk is elevated in tetralogy of Fallot survivors, particularly those with specific ECG findings. Postoperative patients exhibit impaired left ventricular function, highlighting the need for vigilant cardiac monitoring.
Area of Science:
- Cardiology
- Pediatric Cardiology
- Cardiac Surgery
Background:
- Tetralogy of Fallot (T/F) is a complex congenital heart defect requiring surgical correction.
- Long-term outcomes and potential complications in survivors of T/F corrective surgery are critical areas of research.
- Understanding postoperative cardiac function and mortality risk is essential for patient management.
Purpose of the Study:
- To evaluate the incidence of sudden death in T/F survivors post-surgery.
- To assess left ventricular function in patients after T/F corrective surgery.
- To identify electrocardiographic (ECG) predictors of mortality in T/F survivors.
Main Methods:
- Retrospective review of ECGs from 84 T/F survivors with at least 5 years of follow-up.
- Analysis of QRS force ratios (Rs/Sx) on the X-axis from postoperative ECGs.
- Cardiac catheterization in 27 postoperative T/F patients to assess left ventricular function parameters.
Main Results:
- Overall sudden death incidence was 4%, with highest mortality (40%) in patients with right bundle branch block (CRBBB) and left anterior hemiblock (LAH).
- Postoperative T/F patients showed a significantly decreased Rs/Sx ratio.
- Cardiac catheterization revealed mildly diminished left ventricular ejection fraction (LVEF), increased left ventricular end-diastolic volume (LVEDV), and depressed peak dp/dt, Vpm, and Vmax.
Conclusions:
- Patients surviving corrective surgery for Tetralogy of Fallot exhibit impaired left ventricular function.
- Specific ECG abnormalities, including CRBBB and LAH, are associated with increased mortality risk.
- Long-term monitoring and risk stratification are crucial for T/F survivors to mitigate sudden cardiac death risk.
Abstract:
(1) The ECGs of 84 patients who survived corrective surgery for tetralogy of Fallot were reviewed. The overall incidence of sudden death during at least 5 years period of follow-up was 4%, mortality being highest in those with CRBBB and LAH (40%). (2) The ratio of leftward to rightward QRS forces projected on the X axis (Rs/Sx) is significantly decreased in postoperative T/F patients. (3) Twenty-seven patients who had corrective surgery for tetralogy of Fallot underwent cardiac catheterization postoperatively. LVEF was mildly, but significantly diminished and LVEDV was increased significantly, while peak dp/dt, Vpm and Vmax were significantly depressed. These findings indicate that patients who had corrective surgery for tetralogy of Fallot have impaired left ventricular function.